/*
 * Copyright (c) 2023 OceanBase.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.oceanbase.tools.sqlparser.statement.select;

/**
 * {@link RelationType}
 *
 * @author yh263208
 * @date 2022-12-07 11:40
 * @since ODC_release_4.1.0
 */
public enum RelationType {
    // select xxx intersect select xxx
    INTERSECT,
    // select xxx minus select xxx
    MINUS,
    // select xxx except select xxx
    EXCEPT,
    // select xxx union select xxx
    UNION,
    // select xxx union all select xxx
    UNION_ALL,
    // select xxx union unique select xxx
    UNION_UNIQUE,
    // select xxx union distinct select xxx
    UNION_DISTINCT

}
